Electrical contact-making device.



No..676,098. g P a tented'lune u, I901; P. PAPIN. I ELECTRICAL cormwr.mama. DEVICE.

(Application filed Sept. 24, 1900.) (No Model.)

2 Sheets-Sheet l.

No. 676,098. Patented mm H, l90l.

- PAPIN.

V ELECTRICAL ACT IAKINB DEVICE.

y 'cl-tion 1.11 Sept. 9, 1900.)

(No llodul.) 2 Shun-Shoat 2.

\T E;s V A/ENTOR.

Pfaai'an 75.

UNITED STATES PATENT OFFICE.-

PnEsToN PAPIN, on ST. Louis, MISSOURI.

ELECTRICAL CONTA T-MAKI NG DEVICE.

SPECIFICATION forming part of Letters Patent No. 676,098, dated June 11,1901.

Application filed pt m 24| 1900- Serial No. 30,905. (No model.)

To (tZZ whom it may concern:

Be it known that I,'PREsroN R. PAPIN, a citizen of the United States,residing at the city of St. Louis, State of Missouri, have inventedacertain new and useful Improvement in Electrical Contact-MakingDevices, of which the following 'isa full, clear, and exact description,such as willenable others skilled in the art to'which it appertains tomake and use the same, reference being had to the accompanyingdrawings,forming part of this specification, in which- This invention relates toa new and useful improvement in electrical contactmaking sured, andrepairs and adjustments thereof are, consequently less frequent.

With this object in view the invention consists in thearrangement,construction, and combination of the several parts, all aswill be hereinafter described, and afterward pointed out in the claims.

In. the drawings, Figure l is a cletachedelevational View illustratingmy improved contact-making device, showing the relation of theswitch-segments thereto. plan view of the same. Fig. 3

' view of one of the contact-making devices;

I rubbing contact with its respective segment, anIadjusting-screw ofbeing employedto regue late the amount of pressure of said wearingshoeupon its respective segment. In actual practice these shoes wear" toa'conslderable Fig.2 is a top is a detail extent and have to beconstantly adjusted, their life being usually six weeks, thusnecessitating renewal at the end of this period.

My invention consists in mounting a roller a in the wearing-shoe, whichroller is designed to contact with its segment and in this mannerestablish electrical connection withoutsubjecting the parts toconsiderable Wear. I have found that a rolling contact will answer aswellas a rubbing contact, in addition to which a considerable amountofpressure may be exerted upon the roller to make close contact'with itssegment without materially augmenting the power that is re-v quired toactuate the movable segments into and out of operative relation to theirrespective rollers.

In Figs. 4 to 6 I have shown a switchboard of an ordinary rheostat, inwhich a springpressed switch-arm D carriesa roller (i, de

signed to cocperate with the several concentrically-arranged segments Inorder' to arrest .and hold the switch-arm in a desired position, Iprovide a notched track F in juxtaposition to the segment, with which codescribed without in the least departing from the nature and principleof my invention.

Having thus described my invention, what I claim, and desire to secureby LettersPatcut, is

1. In an electrical contact making device,

the combination with the spring a, an adj us ing-screw a for adjustingthe position of the contact-roller, a body portion 0 on the free end ofsaid spring, and a contact-roller a" mounted in said body portion;substantially as described.

2. ThGGOmbiflfitibll with a spring-pressed Ice ' roller mounted in saidarm'and. ootiperating" notched --track, and means. for holding said i vwith said notched track; substantially as deroller against displacementwithout interferv s v scribed. v 1 v ingwithits'vertical movement;substantially I 3, The combination'witha. spring-pressed was described.15 c 5 rotatable arm, of a roller mounted in its free In testimonywhereof I hereunto affix my end, a concentric series of terminalplatesin signature, in the presence of twowitn'esses, the path of said roller,a-notched plate inLjuxthis 22d day of September, 1900. .tapositionthereto, a spring-pressed roller PRESTON R. PAPIN.

mounted in the end of said arm and having Witnesses: 10 an independentvertical movement relative WM. H. SCOTT, thereto, said rollercotiperating'. withsaid' A. S. GRAY.

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